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Mechanical buzz coming from the chassis

I have noticed a mechnical vibration causing a low level buzz eminating from the chassis of one of my monoblocks. The buzz is not audible through the system. It is only audible when your ear is close to the amp. Also if I squeeze the chassis the vibration stops.

The amp is a Quicksilver mid-mono with KT88 tubes.

Any ideas on how to solve the problem?
nick_sr
newbee
4,767 posts
 
Sounds like transformer vibrations/hum. If you can, try mass loading the case, or the transformer with something heavy, lead shot in a bag for example. This might help a lot. BTW, if it is transformer hum it could be a problem with the transformer itself, or a problem with the electrical current feed.
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roscoeiii's avatar
roscoeiii
1,155 posts
 
May be that a bolt on the toroid is loose and needs to be tightened. Or could be DC on the line. If it is DC on the line, you can get a PS Audio Humbuster or an equivalent from Channel Islands Audio. The Humbuster fixed my prob in my last apt. 30 day trial for both products, so if DC on the line isn't the prob then you can return the product with no worries.
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